National Invention Patented Product.

High-tech of QPQ Salt Bath Compounded Treatment (Second Prize for National Progress in Science & Technology and UN Invention & Innovation Prize)

Product Description

The product surface is of bright black color. The surface hardened layer, with a thickness of 0.01 to 0.03mm and an achievable Micro's hardness of HV550 to HV920 (depending on different materials), is called a bright white layer i.e.a Fe-n compound.

Technical Features

1. Powerful Abrasive Resistance

For medium-carbon steel, the abrasion resistance can outperform that of conventional quenching by 30 folds. For low-carbon steel, the abrasion resistance can outdo that of cemented quenching, ionic nitriding and plated hard chromium by 14, 2.8 and 2.1 folds respectively.

2. Super Corrosion Resistance

In salt atmosphere, the corrosion resistance outperforms that of plated hard chromium, plated decorative chromium and stainless steel 1Cr18Ni9Ti by 70, 35 and 5 folds respectively.

3. Fatigue Resistance Improved by 40% or more.

Product Advantages

1. A Role in Protecting the Supporting Shaft Neck is Played.

When fragmentation occurs to the rolling body of the supporting bearing, leaving the bearing totally locked, high-speed sliding friction movement between the inside hole of the adapter sleeve unavailable for relative motion and the mating shaft as well as between the outside conical surface of the adapter sleeve and the inside taper socket of the supporting bearing under high pressure will produce more and more heat, causing the temperature to increase sharply. If it fails to be found and halt the machine, occlusion and adhesion between the adapter sleeve and the supporting shaft neck and even the surface destruction of the shaft neck are absolutely unavoidable.

For instance, the Hainan Guotou Cement Co.,Ltd applied the SKF-branded bearing (Type 24192ECK30/W33) and its supporting withdrawal sleeve (Type AOH24192) to roll-pressed powder process. The September of 2008 saw the occlusion and adhesion between the withdrawal sleeve and the shaft neck, and afterwards, the attempt to repair the damaged shaft neck turned out a failure, causing the costly roller inapplicable. As has been proved inadequate, the surface of the withdrawal sleeve is treated only through phosphatization.

Again for instance, the Division of Natural Gas Application Technology Development of Henan Zhongyuan Oil Field applied the compressor (Type SW132-EM) by the Saifu Company in Italy, with SKF-branded bearing (Type 23218CK/W33). After QPQ Salt Bath Composite Treatment of the adapter sleeve (Type H2318), the rolling body damage stuck phenomenon occurred in 2006. Similarly, occurred the phenomena of high-speed sliding friction between the inside hole of the adapter sleeve and the shaft neck, the high-speed sliding friction between the outside conical surface of the adapter sleeve and the inside taper socket of the supporting bearing and also the evaporation of oil fume outside the machine enclosure, which accounted for an extremely high temperature. However, the machine halt led to the facts that no occlusion or adhesion was detected between the mating shaft neck and the inside hole of the adapter sleeve as well as between the outside conical surface of the adapter sleeve and the inside taper socket of the supporting bearing respectively and that the surface was as bright as a mirror with the geometric tolerance undamaged. It is believed based upon our analysis that the adapter sleeve has played a protective role because it has been conducted with QPQ Salt Bath Treatment, thereby causing a Fe-n compound layer to form on its surface and thus provided with super hardness and abrasive resistance.

It is imperative that an adapter sleeve (or withdrawal sleeve) through Hi-tech QPQ Salt Bath Treatment be applied to a key costly supporting shaft.

2.The Strength of Screw Thread is Improved and the Immobility of Adapter Sleeve Accessories Enhanced.

The QPQ Salt Bath Compounded Treatment facilitates a hardened layer of 0.01 to 0.03mm bright white in color as well as an intermediate layer of 0.3mm or so in thickness to form on the metal surface, therefore, the strength of the screw thread teeth is greatly improved. When locked, no deformation during dismounting or rustiness is to occur. As a result, it facilitates dismounting and solves the problems of high temperature, high humidity and corrosion prevailing in the textile industry.

3.Recycling of Adapter Sleeves can be Achieved by Applying High-accuracy Adapter Sleeves through QPQ Treatment to the Textile Industry.

The bigger outside conical end of the screw thread dismounted from the previous supporting adapter sleeve is obviously deformed and generally discarded as useless. However, for the adapter sleeve through QPQ treatment, almost no deformation can be detected when dismounted, and it can be reused merely by replacing a lock gasket. An adapter sleeve through QPQ Salt Bath Compounded Treatment fails to be defined as a quick-wear part any more.

Tolerances of adapter sleeves, threads, cone diameters and radial runout of cone surfaces